Federal prosecutors said Dalbert Rodriguez was arrested last November and charged with an armed robbery of a CVS store in East Hartford. Authorities say he showed a handgun to the pharmacist and stole numerous bottles of pills from a safe.

The 30-year-old Rodriguez pleaded guilty on Thursday to one count of conspiracy to interfere with commerce through robbery.

Prosecutors say he also admitted robbing and participating in 10 other pharmacy robberies between June 2013 and November 2013 in western Massachusetts, central Connecticut and Providence, R.I.

Rodriguez faces up to 20 years in prison when he’s sentenced on May 16.